The man who reportedly shot dead at least 85 people at a youth camp and killed another seven with a car bomb in the Norwegian capital of Oslo, released a YouTube video calling for conservatives to ’embrace martyrdom’ six hours before the attacks, it has emerged.

Anders Behring Breivik posted the video promoting a fight against Islam, which shows pictures of him wearing a wetsuit and pointing an automatic weapon, hours before he set out on the devastating killing spree.

In a text with the video he detailed his plans for the attacks, writing that he would ‘dress up as a police officer’, adding that it would ‘be awesome as people will be astonished’.

In the disturbing 1,500-page dossier, he wrote that ‘there are situations where cruelty is necessary’ and that it is better to kill too many than not enough’.